Fixed layout of load more button.

* Definend a static widht to the button, once when changing tabs the
  button was expanding outside the container.

* Defined position relative to the element '.asset_collection' (the same
  position set by masonry, after its call), once the button was using
  the position absolute.
Added steps to upload.

* Now user need to fill their profile, accept the privacy police select
  the video and see a thank you message.